BIOS, an acronym for Basic Input/Output System, is essential firmware software embedded on the motherboard of most personal computers and devices. Its primary role is to initialize and control hardware components during the startup process before the operating system takes over.
BIOS performs functions such as conducting a Power-On Self-Test (POST) to check hardware integrity, determining the boot sequence of storage devices, providing a user interface for configuring hardware settings, and storing these settings in CMOS memory with the assistance of a backup CMOS battery. While traditional BIOS is still in use, many modern computers employ UEFI (Unified Extensible Firmware Interface) as a more advanced replacement.
